Improvement in sewing-machines



UNITED STATES PATENT Erica.

JAMES SANG-STER AND AMOS w. SANGSTER, or BUFFALO, NE YORK.

IMPROVEMENT IN SEWING-MACHINES.

Specification forming part of Letters Patent No. [9,155, dated January19,1856.

' To (all whom it may concern:

Be it known that we, JAMES SANGSTER and Arms W. SANGSTER, of Buffalo, inthe county of Erie and State of New York, have invented certain new anduseful Improvements in Sewing-Machines, and we do hereby declare thatthe following is a full and exact description of our method ofconstructing the same, refer ence being had to the accompanyingdrawings.

The same letters in Figures 2, 4, and 5 refer to like parts in each.Fig. 1 is a perspective view of the machine complete. It also representsthe feeding apparatus.

A is the feeding-bar, which is attached to the frame-work by a screw atthe point G. Its upper part is made of elastic metal, so as to springbackward. The spring-bar F is connected to the feed-bar A by a smallrod,H. I is a nut for fastening said rod.

B is a bar, which terminates in an elastic foot-piece, for the purposeof holding the cloth firmly down on the plate J.

O is a nut formed of six or more squares or flat surfaces, (it may alsobe made round and screws up or down the needle-bar.

The feed motion is given as follows: When the needlebar is ascending,the nut O rubs against the lower part of the bar F and forces itbackward from said needle-bar, and at the same time, by means of itsconnection with the rod H to the bar A at the point I, it pulls saidfeedbar A, and thus pushes the cloth (or fabric to be sewed) one stitchahead. The downward movement of the needle-bar allows the bar A tospring backward, so that another stitch will be taken when the barascends again. The length of the stitch is varied by raising or loweringthe nut G by means of the screw upon the needle-bar.

Fig. 2 represents the looper when it is in a position to hold the loopfirmly and to open it properly for the needle to pass through.

A is a piece of flat metal, (rounded at the point,) which catches theloop. It is jointed, and swings loosely on the bar or frame B at thepoint 0.

Z is a cross-piece, upon which the point IV of the bar A rests when theloop is formed. The bar marked B swings back and forth, and is attachedto the plate D at the point E by means of a rivet, around which it ismade movable.

F is a lever, which forms part of the frame B.

J K aretwo pins, projecting upward from the plate D, and operate asstationary to the bar A. I

L is a groove or guide impressed in the plate D for the reception of theneedle.

M is a forked bar, attach ed to the frame B at the point N, and ismadeto move easily upon the pivot at N. This bar is made elastic, so thatthe points may spring together after being separated.

P is a friction-spring attached firmly to the bar M, as may beparticularly seen by refer ence to Figs. 2 or 4 of the accompanyingdrawings.

G is a lever, which gives motion to the looper andreceives its motion bythe revolving of an eccentric, as will be readily seen by reference toFig. 1 of the accompanying drawings. In that figure the eccentric isattached to and revolves with the shaft R. S is a rod fastened to theeccentric and attached to the lever G.

T is a stay or support, upon which the lever G swings at the point U.

The looper is worked as follows: When the lever G in vibrating bringsthe pin H down to its lowest point, as shown in Fig. 4, the frame B isforced back from the needle and the piece A is thrown into a horizontalposition by its upper part rubbing against the pin K, and it issupported in that position by the pin J. hen thelever G ascends,the pinH hits against the lower end of the frictionspring 1?, and in passing itthe pin moves the frame-work at the point E-as a center. The frame-workB is thus moved forward and moves the piece A between the thread and theneedle, thence upward to its point of rest on the cross-piece Z, belowwhich the loop forms, and is held open, as seen in Fig. 2. The end ofthe piece A is made narrower than the aperture at V, so that the threadmay pass freely at each side of it. WVhen the needle descends, the pin Hforces its way downward between the points at X in the spring-frame M,and thus reverses the action of the looper. The piece A is thus made torelease the loop, as shown in Fig. 5, and to regain its position, asshown in Fig. 4c.

The whole machinery, shown by Fig. 2,

guides W. SMITH.

Mil! Spindle.

Patented Jan. 19, 1858.

